Hmm... I'm not so impressed with Biggar's piece because of his conclusion, which is basically: why should we care? It doesn't matter; other people have real problems
I was not sure how to read that. I wasn't sure if he was saying that we should not care what people identify as or we should not care enough to waste money in campaigns to provide support ...
Meanwhile, I looked up the difference between bi-gender and inter-gender and found something similar but different ...
www.quora.com/What-is-the-difference-between-genderfluid-and-bigender
"Bi-gender is a specific identity under the nonbinary umbrella, someone who feels an ongoing need to express both male and female personas. Non-fluid bi-gender people can choose the most opportune time to present as male or female. Some bi-gender people might also identify as a crossdresser, drag queen, or drag king, and be completely comfortable in that scene.
NOTE: A crossdresser, drag queen or drag king, can be cisgender, trans woman, trans man, bi-gender, genderfluid, etc. Crossdressing is simply an activity. A crossdresser is simply someone who enjoys crossdressing enough, to see it as part of their identity.
Someone who likes femme name and female pronouns when dressed as a woman, and male name and pronouns when dressed as a man, is one sign of a bi-gender identity. To contrast, if that same bi-gender person is also genderfluid, their pronoun has switched INSIDE THEM BEFORE they even decide what to wear." (it continues ...)